Portion of a LED light bulb



FIG. 1 is a perspective view of an portion of a LED light bulb showing my new design;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a rear view of FIG. 1;

FIG. 4 is a left side view of FIG. 1;

FIG. 5 is a right side view of FIG. 1;

FIG. 6 is a top view of FIG. 1; and,

FIG. 7 is a bottom view of FIG. 1.

The broken lines in the figures form no part of the claimed design. 

CLAIM The ornamental design for a portion of a LED light bulb, as shown and described. 